Increasing amounts of drug-resistant pathogens have been found in some medical facilities. Poorly-ventilated spaces also tend to act as incubators for contagious diseases, such as cabins, movie theaters, poultry farms, and subways. Silver has been used for the prevention of infection for thousands of years. Unlike chemically-synthesized compounds, silver has no issues of chemical sensitivity and antibiotic resistance. Nanosilver refers to nanoparticles of silver and holds superior surface activity and antiseptic capability. With nanosilver dispersed evenly on the surface, Nanonaso® is equipped with remarkably anti-microbial characteristics yet no breathing comfort would be compromised. Nanonsao® nanosilver has been tested via AHRI, SGS, and NTOU virus lab. Experimentally-proven to possess above 90% germ killing effect over H1N1 flu virus, H6N1 avian flu virus, E.coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Streptococcus pneumonia.